/*
 * Copyright (c) 2003-2010, Live Media Pty. Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, this list of
 *     conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice, this list of
 *     conditions and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *  3. Neither the name of Live Media nor the names of its contributors may be used to endorse
 *     or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.colony.remote.rpc;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import com.argot.remote.MetaInterface;
import com.argot.remote.MetaLocation;
import com.argot.remote.MetaMethod;
import com.colony.remote.RemoteException;
import com.colony.remote.RemoteRuntimeException;

public class RpcMetaStub
implements InvocationHandler
{
	MetaLocation _location;
	MetaInterface _mClass;
	RpcMetaClient _client;
	
	public RpcMetaStub( RpcMetaClient client, MetaLocation location , MetaInterface mClass )
	{
		_client = client;
		_location = location;
		_mClass = mClass;
	}

	public Object invoke(Object proxy, Method method, Object[] args)
	throws Throwable
	{
		// First look for a client side stub that will override
		// the default request mechanism.
/*
		Method stubMethod = null;
		try
		{
			// The method we're looking for must have the same
			// parameters as the original method.
			if ( args != null )
			{
				Class[] cargs = method.getParameterTypes();
					
				stubMethod = this.getClass().getMethod( method.getName(), cargs );
			}	
			else
			{
				stubMethod = this.getClass().getMethod( method.getName(), null );
			}
		}
		catch (SecurityException e)
		{
		}
		catch (NoSuchMethodException e)
		{
		}
		
		// We have an overriding method handler.
		if ( stubMethod != null )
		{
			try
			{
				return stubMethod.invoke( this, args );
			}
			catch (IllegalArgumentException e1)
			{
				throw e1;
			}
			catch (IllegalAccessException e1)
			{
				throw e1;
			}
			catch (InvocationTargetException e1)
			{
				throw e1.getTargetException();
			}
		}	
*/
		// Find the MetaMethod information.
		MetaMethod mMethod = _mClass.getMetaMethod( method );
		if ( mMethod == null )
		{
			throw new RemoteException("method not available");
		}
		
		// Create and process the request.
		RpcMetaMethodRequest request = new RpcMetaMethodRequest( _location,  mMethod, args );
		
		_client.process( request );
		
		// Check for errors and return values.
		if ( request.getException() != null )
		{
			// if the exception returned is declared, throw it.
			Throwable throwable = request.getException();
			Class exceptionTypes[] = method.getExceptionTypes();
			for (int x=0;x<exceptionTypes.length;x++)
			{
				if (exceptionTypes[x].isAssignableFrom(throwable.getClass()))
				{
						throw throwable;
				}
			}

			// if the exception isn't declared, throw a remoteRuntimeException.
			throw new RemoteRuntimeException("Exception not declared",throwable);
		}
		Class retType = method.getReturnType();
		if ( retType == Void.class || retType == void.class )
			return null;
		
		return request.getReturnValue();
	}

	public String type()
	{
		return _mClass.getTypeName();
	}


}
